Pipe-coupling



A. WILBUR. i

PIPE GOUPLNG.

Patented Mar. 30, 1886.

UNITED STATES PATENT GEEICE.

ALEEED'WILBUR, oF. ALLEGHENY CITY, PENNSYLVANIA.

PIPE-COUPLING.

SPECIFICATION forming part of Letters Patent No. 339,036, dated March 30, 1886. Application filed August 22, 1885. Serial No. 175,098. (No model.)

To a/ZZ whom it may concern:

Be it known that I, ALFRED WILBUR, of Allegheny City, in the county of Allegheny and State of Pennsylvania, have ,invented a new and useful Improvement in PipeGoupliegs; and I do hereby declare that the followingis a full, clear, and exact description of the same.

My invention is an improved coupling for gas, steam, or water pipes2 or any pipes requiring close-fitting joints.

'The object of the invention is to provide a tight joint capable of resisting strain without becoming loose, and adapted to be readily appipe and closing the opening to theinterior of vthe sleeve, the space between the ends of the sleeve and the ribs containing a suitable filling.

The invention also consists in the method of applying the described sleeve, and in details of eonstwrnction, all as hereinafter explained.

The eonstructioiris shown in the accompa- -nying drawings, in which Figure l represents a central 'bngitudinal section of the coupling` sleeve with the end of the pipein place. Fig. 2 shows an end elevation, and Fig. 3 shows one end of the pipe removed from the sleeve.

The coupling-sleeve is shown at A, subst-autially tubular in form. Its interior surface is recessed at each end with recesses or chambers, which extend from a. point nearthc ends of the sleeve and terminate at a suitable distance from the center thereof. The inner wall or termination of each chamber is formed by an annular rib on the inner face of the sleeve, preferably V-shaped in cross-section, as shown at ein Fig. l. The walls of the chamber, at

the outer ends of the sleeve, are formed by.

`smooth or unthread'ed portions, to which the pipe is accurately fitted, the pipe also being accu rately`1itted vto the rib The sleeve thus formed maybe slipped upon the pipe and adjusted by slipping accurately in place upon the two ends of the pipe. These pipe ends need not be brought together, it being only necessary that they should enter the ribs a',

and the-space between the ends may be unoccupied except bythe gas or waterin t-he pipe. The recesses are provided with coarse interior threads, 3, (shown in the drawings as rounded,) with the ridges between cut down so as V to form the chamber or recess.

Coarse exterior threads are formed on the ends of the pipes, preferably with inclined sides and itat bottoni, as shown in the drawings. Coarse threads and threads thus formed are used for the purpose of allowing the lead to enter more freely and completely.

It will be observed from an inspection of the drawings that the threaded portion of the pipe end lies within the recess or chamber in the sleeve when the pipe is in place. There! fore when the lend is run into the chamber surrounding this threaded portion it fills the thread and the whole chamber, but is retained within the chamber by the close tit of the pipe upon the inner-and outer walls ot' the cham ber-that is to say, the rib a* and the part of the sleeve at the end bearing upon the pipe.

This forms a tight packing bythe contact of the lead with the threaded surface of the pipe. At the sametimethat'thistight jointis formed by contact oflead with the metal ot` the pipe the pipe is supported inthe sleeve by contact withthe hard metal of the sleeve, this by reason of' its bearings at the end of the sleeve and upon the rib .'1'. The coupling has therefore the same strength and rigidityas if the pipe, were secured into an ordinary threaded sleeve, and at the sume time the tightness of thelead packing ou the threaded surface is secured. At the same time no turning of the pipe or sleeve is required in coupling, and by reason of the threaded pipe end the connection may be broken b v nnscrewing in the same manner as in the ordinary pipe-coupling. The threads in the recessed surface ot' the sleeve itself serve as a loclejoint and to uid4 in forming a tight joint between lead and sleeve to hold the lead in the sleeve. Un the outside of the sleeve au elongated cup, l, is formed, having holes o leading into theannnlar chainbers heretofore described, and to insure a perfect llow of lead, airholes i 'i are formed from the threads to the outside on the opposite side of the sleeve. The lead or other easil 1-insible metal is poured into the cup after the sleeve and pipes are properly placed.

j able material.

lthreads of the sleeve,

of packing have been heretofore With the coarse threads and the construction in other respects as above described the lead under ordinary circumstances will form an impervious joint; but for greater security,-

and where extraordinary means arerequire to resist pressure upon the joint, I expand the sleeve by heat before slipping it upon they ends of the pipes,

expanded and while in place I pour in the and after it has beenl thus lead in the manner described. The sleeve in cooling contracts and reduces the size of the chamber, thus compressing the lead and causing it more completely to fill all the spaces and to exclude air-holes, which lmight otherwise be formed.

It will Abe apparent that sections of pipe may be put together in the manner above dethus joined may all be handled as l nary threaded couplings, without danger of rupturing or displacing the lead, as would be the case if the bearing of the pipe were wholly upon the lead.

I am aware heretofore formed in which the couplingsleeve and pipe were united by being screwed together, the thread of the pipe fitting the (as in the patent of Young, September 15, 1885,) with a lead packing run into the chamber formed in the sleeve and about the pipe; and my invention is distinguished from this' by the fact that the pipe is not threaded into the metal of the sleeve, but the sleeve is adapted to slip upon the pipe. I am alsoV aware that very many forms which leadis poured or packed around the lpipe between it and the sleeve. My invention differs from. these in this, that the pipe while being adapted to allow the. sleeve to be slipped back'upon the pipe for convenience in putting down, and

` and my improved .place upon the that .pipecouplings have beenas described.

known in.

to slip into the sleeve, or

while the pipe has the threaded lead connection or packing, it still bears upon the metal of the sleeve,` and thus is formed a rigid and strong connection, as heretofore explained; method is applicable only and is confined to the described chambered sleeve arranged in the manner described with the pipe; and the advantage resulting from the heating of th sleeve before applying it to the pipe is that by so heating the chamber is enlarged and when the sleeve cools a-fter the lead is poured in the chamber is contracted, and thus the lead is compressed, forcing it into a better and more secure joint.

I claim asmyv invention- 1. In combination with threaded pipe end, a sleeve covering the same, recesses to form a.

chamber having ribs w w, said sleeve'also having unthreaded ends tting closely around the pipe and closing the opening to the interior ofthe sleeve,the spacesbetween the ends of the sleevey andthe ribs containing a suitable filling, substantiallyas described. l

2. 'Ihe method of combining the described chambered coupling-sleeve with the described threaded pipe end, the same consisting in irstv heating the sleeve andthen, while it 'is still hot and expanded, slipping it into its proper threaded pipe end, then pouring in the melted lead and allowing it to cool,

vwhereby the lead is compressed, all'as set forth. A

3. In combination withthreaded pipe ends, a sleeve covering thesanie, having internal threads, 3, ribs unthreaded ends fitting closely around the pipe and closing the opening to the interior of the sleeve, the spaces between the ends of the sleeve and the ribs 'x containing a suitable filling, substantially In testimony whereoi` I have ysigned my name to this specification in the presence of two subscribing witnesses.

y ALFREDA WILBUR. \Vitnesses: l Y JAs. P. Quinn,

ANDREW FISHER. 

